Agent skill

Cheatsheet Variables

One-page reference for declaring and assigning variables in MDL microflows — every type, with the exact syntax.

Apache-2.0Auto-check passed

Install Cheatsheet Variables

skills CLI

$ npx skills add mendixlabs/mxcli --skill cheatsheet-variables -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install mendixlabs/mxcli cheatsheet-variables --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/mendixlabs/mxcli.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/mendix/cheatsheet-variables .claude/skills/cheatsheet-variables && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "cheatsheet-variables" agent skill from https://github.com/mendixlabs/mxcli/tree/main/.claude/skills/mendix/cheatsheet-variables into .claude/skills/cheatsheet-variables/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cheatsheet-variables", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/mendixlabs/mxcli/tree/main/.claude/skills/mendix/cheatsheet-variables

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add mendixlabs/mxcli --skill cheatsheet-variables -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install mendixlabs/mxcli cheatsheet-variables --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mendixlabs/mxcli.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/mendix/cheatsheet-variables .agents/skills/cheatsheet-variables && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "cheatsheet-variables" agent skill from https://github.com/mendixlabs/mxcli/tree/main/.claude/skills/mendix/cheatsheet-variables into .agents/skills/cheatsheet-variables/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cheatsheet-variables", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add mendixlabs/mxcli --skill cheatsheet-variables -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install mendixlabs/mxcli cheatsheet-variables --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mendixlabs/mxcli.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/mendix/cheatsheet-variables .cursor/skills/cheatsheet-variables && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "cheatsheet-variables" agent skill from https://github.com/mendixlabs/mxcli/tree/main/.claude/skills/mendix/cheatsheet-variables into .cursor/skills/cheatsheet-variables/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cheatsheet-variables", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/mendixlabs/mxcli.git --path .claude/skills/mendix/cheatsheet-variables

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add mendixlabs/mxcli --skill cheatsheet-variables -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install mendixlabs/mxcli cheatsheet-variables --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mendixlabs/mxcli.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/mendix/cheatsheet-variables .gemini/skills/cheatsheet-variables && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "cheatsheet-variables" agent skill from https://github.com/mendixlabs/mxcli/tree/main/.claude/skills/mendix/cheatsheet-variables into .gemini/skills/cheatsheet-variables/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cheatsheet-variables", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install mendixlabs/mxcli cheatsheet-variables

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add mendixlabs/mxcli --skill cheatsheet-variables -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/mendixlabs/mxcli.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/mendix/cheatsheet-variables .github/skills/cheatsheet-variables && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "cheatsheet-variables" agent skill from https://github.com/mendixlabs/mxcli/tree/main/.claude/skills/mendix/cheatsheet-variables into .github/skills/cheatsheet-variables/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cheatsheet-variables", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add mendixlabs/mxcli --skill cheatsheet-variables -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install mendixlabs/mxcli cheatsheet-variables --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mendixlabs/mxcli.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/mendix/cheatsheet-variables .opencode/skills/cheatsheet-variables && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "cheatsheet-variables" agent skill from https://github.com/mendixlabs/mxcli/tree/main/.claude/skills/mendix/cheatsheet-variables into .opencode/skills/cheatsheet-variables/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cheatsheet-variables", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: cheatsheet-variables
GitHub stars: 128
Token cost: ~1.2k tokens
SKILL.md length: 319 words
Files: 1
Skills in repo: 75
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

One-page reference for declaring and assigning variables in MDL microflows — every type, with the exact syntax.

Works in 5 steps: Primitives… → Objects (entities): Never declare an… → Lists: Never declare a list — same… → …
Writing a declare and unsure of the spelling
SKILL.md covers Declaration Syntax, Key Rules, Common Mistakes and Special Values, plus 2 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Cheatsheet Variables is an agent skill from mendixlabs/mxcli. One-page reference for declaring and assigning variables in MDL microflows — every type, with the exact syntax. Use when writing a declare and unsure of the spelling, or when a declaration error needs fixing fast.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: Mendix cli tool, a headless way to work with Mendix projects. Enables Mendix projects for use with 3rd party agentic coding tools like Claude Code and Copilot. Includes a… The licence is Apache-2.0.

When your agent uses it

Writing a declare and unsure of the spelling
A declaration error needs fixing fast

Example prompts

“/cheatsheet-variables”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

Primitives (String/Integer/Long/Decimal/Boolean/DateTime/Enumeration): Use declare $var type = value; — these are the only types declare…
Objects (entities): Never declare an object. Mendix forbids the Create Variable activity from holding an object (CE0053/CE0038, plus…
Lists: Never declare a list — same Create Variable restriction (CE0053/CE0038, flagged as MDL040). Get the list from a microflow…
SET requires DECLARE: Always declare primitive variables before using SET.
Parameters are pre-declared: Microflow parameters don't need DECLARE (and a parameter may be an object/list type — that restriction is…

What it can do on your machine

Read from SKILL.md and the folder at commit a924d11. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are mdl).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Cheatsheet Variables loads about 1.2k tokens when it runs. Until then it costs about 59 tokens; SKILL.md has 319 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~59
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from mendixlabs/mxcli at commit a924d11, republished under its Apache-2.0 licence (© mendixlabs). 319 words, ~1,217 tokens.

Download SKILL.mdSave it as .claude/skills/cheatsheet-variables/SKILL.md (or your agent's skills folder).

name: cheatsheet-variables
description: One-page reference for declaring and assigning variables in MDL microflows — every type, with the exact syntax. Use when writing a `declare` and unsure of the spelling, or when a declaration error needs fixing fast.

MDL Variable Cheatsheet

Quick reference for variable declarations in MDL microflows.

Declaration Syntax

Type	Syntax	Example
String	`declare $name string = 'value';`	`declare $message string = '';`
Integer	`declare $name integer = 0;`	`declare $count integer = 0;`
Boolean	`declare $name boolean = true;`	`declare $IsValid boolean = true;`
Decimal	`declare $name decimal = 0.0;`	`declare $Amount decimal = 0;`
DateTime	`declare $name datetime = [%CurrentDateTime%];`	`declare $Now datetime = [%CurrentDateTime%];`
Enumeration	`declare $name Enumeration(Module.Enum) = Module.Enum.Value;`	`declare $s Enumeration(Sales.Status) = Sales.Status.Open;`
Object (Entity)	Do not declare — use a parameter, `retrieve`, `create`, or loop iterator	`$Customer = create Sales.Customer (Name = $n);`
List	Do not declare — use a parameter, `retrieve`, or `create list`	`$Orders = create list of Sales.Order;`

Key Rules

Primitives (String/Integer/Long/Decimal/Boolean/DateTime/Enumeration): Use declare $var type = value; — these are the only types declare (a Create Variable activity) accepts.
Objects (entities): Never declare an object. Mendix forbids the Create Variable activity from holding an object (CE0053/CE0038, plus CE7247 on a later set; flagged as MDL043 by mxcli check) — bare or initialized. Get the object from a microflow parameter, a retrieve … first, $var = create Module.Entity(...), or a loop iterator. There is no "empty object variable" and no aliasing activity — reuse the variable you already have.
Lists: Never declare a list — same Create Variable restriction (CE0053/CE0038, flagged as MDL040). Get the list from a microflow parameter, a retrieve, or $var = create list of Module.Entity;
SET requires DECLARE: Always declare primitive variables before using SET.
Parameters are pre-declared: Microflow parameters don't need DECLARE (and a parameter may be an object/list type — that restriction is only on declare).

Common Mistakes

Object (Entity) "Declaration" — there is no such thing

mdl

-- WRONG: declaring an object — Mendix rejects it (CE0053/CE0038, MDL043)
declare $Product Module.Product;            -- bare form is invalid
declare $Product Module.Product = $In;      -- aliasing a parameter is invalid
declare $Product as Module.Product;         -- the AS keyword is also a parse error

-- CORRECT: get the object from a source that produces one
$Product = create Module.Product (Name = $n);     -- create
retrieve $Product from Module.Product where Code = $c first;  -- retrieve
-- or accept it as a parameter, or use a loop iterator: loop $Product in $Products ...

SET Without DECLARE

mdl

-- WRONG: Variable not declared
if $value > 10 then
  set $message = 'High';  -- ERROR!
end if;

-- CORRECT: Declare first
declare $message string = '';
if $value > 10 then
  set $message = 'High';
end if;

Lists (never declared)

mdl

-- WRONG: declaring a list — Mendix rejects it (CE0053/CE0038, MDL040)
declare $Items list of Module.Item = empty;

-- CORRECT: build the list without declare
$Items = create list of Module.Item;          -- empty list to accumulate into
retrieve $Items from Module.Item where ...;    -- or populate from the database
-- or accept it as a parameter: create microflow M.Process ($Items: list of Module.Item) ...

Special Values

Value	Usage
`empty`	Null/empty value for any type
`[%CurrentDateTime%]`	Current date and time
`[%CurrentUser%]`	Currently logged in user object
`true` / `false`	Boolean literals

Parameter vs Variable

mdl

mdl 1;
create microflow Module.Example (
  $Input: string,              -- Parameter: auto-declared
  $entity: Module.Customer     -- Parameter: auto-declared
)
returns boolean
begin
  -- Parameters $Input and $Entity are already available

  declare $Result boolean = true;  -- Local primitive: must declare
  -- Need a local object? Don't declare it — create/retrieve it:
  $Order = create Module.Order (Reference = $Input);  -- or retrieve … first

  return $Result;
end;

Variable Scope

Parameters: Available throughout the microflow
DECLARE variables: Available from declaration point forward
Loop variables: Only available inside the loop body

mdl

loop $item in $ItemList
begin
  -- $Item is available here (derived from list type)
  set $count = $count + 1;
end loop;
-- $Item is NOT available here

Files

Just SKILL.md in .claude/skills/mendix/cheatsheet-variables of mendixlabs/mxcli.

Open the folder on GitHubat commit a924d11

Compare with similar skills

Cheatsheet Variables next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Cheatsheet Variables compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Cheatsheet Variables this skillmendixlabs/mxcli	128	—	~1.2k	Automated safety check: Pass	Apache-2.0	today
Declarative Agentsgithub/awesome-copilot	40k	1 repos	~1.2k	Automated safety check: Pass	MIT	today
GitHub Issue Bulk Assignercodewhale-hq/Codewhale	41k	—	~953	Automated safety check: Pass	MIT	today
MCP Create Declarative Agentgithub/awesome-copilot	40k	2 repos	~2k	Automated safety check: Notes	MIT	today
Imperative To Declarative Fletflet-dev/flet	17k	—	~829	Automated safety check: Pass	Apache-2.0	today
Testing API For Mass Assignment Vulnerabilitymukul975/Anthropic-Cybersecurity-Skills	34k	—	~4k	Automated safety check: Pass	Apache-2.0	1 mo ago

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Questions about Cheatsheet Variables

What does Cheatsheet Variables do?

One-page reference for declaring and assigning variables in MDL microflows — every type, with the exact syntax. Cheatsheet Variables is an agent skill from mendixlabs/mxcli. One-page reference for declaring and assigning variables in MDL microflows — every type, with the exact syntax.

When should I use Cheatsheet Variables?

Cheatsheet Variables fits situations like: writing a declare and unsure of the spelling; A declaration error needs fixing fast.

How do I install Cheatsheet Variables in Claude Code?

Run `npx skills add mendixlabs/mxcli --skill cheatsheet-variables -a claude-code`. Or copy the skill folder (.claude/skills/mendix/cheatsheet-variables in mendixlabs/mxcli) into .claude/skills/cheatsheet-variables in your project. Claude Code loads it when a task matches its description.

How do I install Cheatsheet Variables in Codex?

Run `npx skills add mendixlabs/mxcli --skill cheatsheet-variables -a codex`. Or copy the skill folder (.claude/skills/mendix/cheatsheet-variables in mendixlabs/mxcli) into .agents/skills/cheatsheet-variables in your project. Codex loads it when a task matches its description.

Can I use Cheatsheet Variables in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mendixlabs/mxcli --skill cheatsheet-variables -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cheatsheet-variables, .gemini/skills/cheatsheet-variables, .github/skills/cheatsheet-variables and .opencode/skills/cheatsheet-variables in your project.

What does Cheatsheet Variables need to run?

SKILL.md names no scripts, command-line tools or credentials: Cheatsheet Variables is instructions for the agent only.

Does Cheatsheet Variables access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Cheatsheet Variables safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Cheatsheet Variables use?

Cheatsheet Variables is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Cheatsheet Variables use?

About 1.2k tokens (SKILL.md is roughly 4.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Cheatsheet Variables?

Skills that share tags, products or a category with Cheatsheet Variables: Declarative Agents (github/awesome-copilot, 40k stars), GitHub Issue Bulk Assigner (codewhale-hq/Codewhale, 41k stars), MCP Create Declarative Agent (github/awesome-copilot, 40k stars) and Imperative To Declarative Flet (flet-dev/flet, 17k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Cheatsheet Variables?

mendixlabs (a GitHub organization) maintains it in mendixlabs/mxcli, which has 128 GitHub stars. The repository holds 75 skills in this directory. The repository was last updated on October 7, 2026.

Source: mendixlabs/mxcli on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Cheatsheet Variables

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

MDL Variable Cheatsheet

Declaration Syntax

Key Rules

Common Mistakes

Object (Entity) "Declaration" — there is no such thing

SET Without DECLARE

Lists (never declared)

Special Values

Parameter vs Variable

Variable Scope

Files

Compare with similar skills

Similar skills

More from mendixlabs/mxcli

Questions about Cheatsheet Variables